نتایج جستجو برای: permitted limit
تعداد نتایج: 208068 فیلتر نتایج به سال:
BACKGROUND Nickel contact allergy is still frequent both in patch-tested patients and in the general population. Objectives. To explain this observation by relating clinical epidemiological data with recent chemical analyses of nickel release from costume jewellery. METHODS (i) The trend of nickel allergy was analysed using data registered between January 1994 and December 2009 in the Informa...
Background and Objectives: Synthetic dyes are an important group of additivesused in food products, and because of health concerns about consuming population, the application of these compounds is needed to be enough controlled. The aim of this study was to investigate the types and frequencies of the dyes used in making pastries in the confectionery of Tuyserkan city. Materials and Methods: I...
Lorentz’ objection to the Uhlenbeck-Goudsmit proposal of a spin magnetic moment of the electron, namely that the electron’s equatorial rotation speed would exceed the speed of light by a factor ≈ 10, mutated into an objection against Lorentz electrodynamics (LED) itself when the spin magnetic moment became established. However, Lorentz’ renormalization calculation, based on the early 20th centu...
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